FLYWHEEL MAGNET ROTOR

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PROBLEM TO BE SOLVED : To provide a flywheel magnet rotor wherein a permanent magnet composed of a rare-earth magnet or the like is fixed on a flywheel without use of adhesive. SOLUTION : A ring-shaped portion 12a provided in a magnet holding member 12 holding magnets 13 is fitted in the inner circumferential portion of the peripheral wall portion 11a of a flywheel 11 close to its open end. An annular member 14, such as a ring gear, is shrink fitted or force fitted on the outer circumferential portion of the peripheral wall portion of the flywheel where the ring-shaped portion 12a is fitted. The peripheral wall portion 11a of the flywheel is biased toward the inner radius side to tighten the ring-shaped portion 12a of the magnet holding member by shrink fitting or force fitting the annular member. The magnet holding member 12 is thereby firmly fixed on the flywheel. COPYRIGHT : (C)2008, JPO&INPIT